My problem is this: I need to determine if a wall is load bearing or not. The wall in question is on the first floor (of a two story Colonial). The wall in question is directly under a wall on the second floor. However, there is no wall in the basement under the wall in question (and no beam or otherwise heavy support structure, just a large empty room with the floor joists as the ceiling). There are relatively large truss like joists (made of 2X4) that extend, uninterrupted, from the front of the house to the back of the house (the wall in question is perpendicular to the direction of these floor joists). The floor joists/trusses are identical for the first and second floors; therefor, I believe that the wall is non-load-bearing since there is absolutely no support in the basement? I would like to remove the wall and I am not sure if I need to use a header or not. Any help would be much appreciated. Thanks...Bari